Hello,

The main tip I can give you for this is that you always musttranslatethe sentences given in the text.

Here : "she wants her stopping distance" << this is d "not to exceed 240ft", that is d<240.

So you have to find v such that d = v + vē/20 < 240.

Think "quadratic" !

Advice : be careful, speed is in mi/h and distance in ftin the formula. So don't bother changing the units to be the same or wondering about them your result will automatically be in mi/h.

Edit : woah... 28th post